It's pretty much guaranteed that whatever Meghan Markle wears will sell out. Well, that is if it wasn't custom made or impossible to get your hands on (which has happened quite a bit given the whole royal thing). Even then, though, I'd be willing to bet that at least one person got pretty close to sourcing the same thing. Luckily, her latest outfit isn't quite so tricky to recreate, one, because it costs under $250, and two, because it's still very much in stock at Moda Operandi.

Ahead of her 42nd birthday, Markle was spotted on a dinner date with Prince Harry at Tre Lune in Montecito, California wearing a black-and-cream striped tube dress that's both reasonably affordable and majorly chic.

The dress, called the Theo, was designed by the Australian label Posse, which has been allover the fashion news of late ever since Sofia Richie Grainge wore a linen two-piece set from the brand during her wedding weekend in the South of France.

Before Markle's date-night dress sells out like Richie Grainge's set did after she wore it, scroll down and snag one while supplies last.

On Meghan Markle: Posse Theo Striped Jersey Strapless Maxi Dress ($240)

I need.

This set is perfect for traveling. Shop the matching Tia High-Waisted Linen Flared-Leg Pants ($300).

A white dress works for pretty much any daytime occasion.

This color has me in a chokehold.

Just easy.

Yes, yes, 1000% yes. Shop the matching Ducky Oversized Paperbag-Waist Linen Pants ($270).

An even more affordable striped tube dress to consider.

The curved neckline on this H&M dress is so unique.

This dress is making the rounds in the WWW office.

Gorgeous.

Nothing's stopping you. Just do it.

I'm absolutely smitten with this one.

Sale alert.

If you're tired of LBDs, might I suggest this chocolate-brown alternative?

Or this mossy-green one?

Norma Kamali's dresses belong in everyone's closet.